Experiment
Hazard Class 11 – Hydrogen

Applicability

This hazard classification
applies to all experiments and processes involving the use of gaseous hydrogen. This class includes work performed in the Experiment Hall Beamline Stations and any preparatory/setup/testing work performed in the LOM laboratories.
Other hazard controls such as fire protection and life safety regulations
may apply to experiments of this hazard class. A summary of controls for
hydrogen use is available in the hydrogen summary document.

Experiment Category

Experiments involving
new equipment or modified hazard control schemes are categorized as high risk.

Experiment Hazard
Control Verification Statements

Engineered
Controls – Applicable controls for storage and use of hydrogen. The quantities of hydrogen used and/or stored must be limited.
Flash back arrestors must be
provided on all hydrogen supplies and must be located immediately
downstream of the first regulator or other location determined by a
safety review.
Flammable mixtures of hydrogen are to be used in a ventilated, sprinklered area. Avoid the use of spark producing
equipment.

Procedural
Controls – SOP is required to define startup, shutdown, normal and emergency
operations, purging, maximum flow rates for hydrogen, and PPE for handling gas cylinders. The need for an SOP is also required for small quantities of hydrogen. Line supervisors are responsible for the preparation and approval of the operating procedures

Design Reviews
and Equipment Inspections – All experiments and operations involving the
storage, use, or generation of hydrogen must undergo a documented safety review. The review may include not APS entities at Argonne. Any safety reviews provided by non-APS Argonne personnel shall be documented and forwarded to the APS User Safety Officer.

Experiment Authorization

Unless otherwise
noted in the approved experiment safety plan, the Director of the APS Engineering Support Division delegates the authority to authorize an experiment in this hazard
class to a member of the APS Experiment Review Board and any of the persons
in the beamline personnel that appear in the
list of Beamline Manager personnel authorized to approve experiments.

Hazard Control
Verification

The Director
of the APS Engineering Support Division delegates responsibility for verifying that
required controls are in place to personnel delegated the authority to perform
this task to the experiment On-site Spokesperson, and Beamline Management
personnel having experiment safety responsibilities.